EP3964724B1 - Rouleau pour palier à rouleaux, agencement doté d'un outil de ponçage et d'un rouleau pour un palier à rouleaux, ainsi que procédé de fabrication d'un rouleau pour un palier à rouleaux - Google Patents

Rouleau pour palier à rouleaux, agencement doté d'un outil de ponçage et d'un rouleau pour un palier à rouleaux, ainsi que procédé de fabrication d'un rouleau pour un palier à rouleaux Download PDF

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Publication number
EP3964724B1
EP3964724B1 EP21193248.8A EP21193248A EP3964724B1 EP 3964724 B1 EP3964724 B1 EP 3964724B1 EP 21193248 A EP21193248 A EP 21193248A EP 3964724 B1 EP3964724 B1 EP 3964724B1
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EP
European Patent Office
Prior art keywords
roller
profile
grinding tool
grinding
arrangement
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EP21193248.8A
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German (de)
English (en)
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EP3964724A1 (fr
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Mathias Haissig
Helmut Haupt
Johannes Ullmann
Markus Volkmuth
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SKF AB
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SKF AB
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/34—Rollers; Needles
    • F16C33/36—Rollers; Needles with bearing-surfaces other than cylindrical, e.g. tapered; with grooves in the bearing surfaces
    • F16C33/366—Tapered rollers, i.e. rollers generally shaped as truncated cones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • B24B19/06—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements for grinding races, e.g. roller races
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/37—Single-purpose machines or devices for grinding rolls, e.g. barrel-shaped rolls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/34—Rollers; Needles
    • F16C33/36—Rollers; Needles with bearing-surfaces other than cylindrical, e.g. tapered; with grooves in the bearing surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/02—Mechanical properties
    • F16C2202/08—Resilience, elasticity, super-elasticity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2206/00—Materials with ceramics, cermets, hard carbon or similar non-metallic hard materials as main constituents
    • F16C2206/40—Ceramics, e.g. carbides, nitrides, oxides, borides of a metal
    • F16C2206/58—Ceramics, e.g. carbides, nitrides, oxides, borides of a metal based on ceramic nitrides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/60—Shaping by removing material, e.g. machining
    • F16C2220/62—Shaping by removing material, e.g. machining by turning, boring, drilling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/60—Shaping by removing material, e.g. machining
    • F16C2220/70—Shaping by removing material, e.g. machining by grinding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/30—Angles, e.g. inclinations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/48—Particle sizes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/10—Application independent of particular apparatuses related to size
    • F16C2300/14—Large applications, e.g. bearings having an inner diameter exceeding 500 mm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2322/00—Apparatus used in shaping articles
    • F16C2322/12—Rolling apparatus, e.g. rolling stands, rolls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/10—Railway vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/31—Wind motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/61—Toothed gear systems, e.g. support of pinion shafts

Definitions

  • Rollers for roller bearings usually have a straight profile on their respective end faces, that is, the end faces are neither curved inwards nor outwards. However, in certain applications it can happen that a straight end profile leads to high friction and thus to high temperatures.
  • straight ground end faces i.e. end faces that run perpendicular to the roller axis
  • an unfavorable roller-board contact can result, which can lead to increased friction, wear or bearing damage under axial load.
  • rollers with a ground end profile with a constant, spherical curvature are known, which, however, have the disadvantage that they have to be manufactured very precisely in order to prevent critical operating conditions, such as edge running or contact ellipse cutting.
  • a role according to the preamble of claim 1 shows DE 102 30357 A1 .
  • a roller for roller bearings with two end faces and one running surface is described below.
  • at least one end face has an at least partially ground profile with a non-constant curvature.
  • a roller bearing equipped with such a roller can in particular have a higher axial load capacity and can be used, for example, as a wheel set bearing, gearbox bearing, traction motor bearing of rail vehicles, wind turbine bearings, rolling mill bearings.
  • a non-constant curvature is understood to mean a curvature of a curve whose radius of curvature is not constant along the course of the curve, but rather changes.
  • the curvature of the curve that corresponds to the ground profile of the end face and runs from a starting point to an end point may become stronger or weaker as the distance from the starting point increases.
  • the curvature is determined along a curve running in the radial direction.
  • the curvature is a logarithmic curvature and/or the profile is a toroidal profile.
  • An end face profile with a logarithmic curvature and/or a toroidal crowned profile makes it possible to avoid edge running and to reduce friction in the end face contact of roller bearings.
  • the roller can in particular be a tapered roller, which is used accordingly in a tapered roller bearing.
  • the end face with the at least partially ground profile abuts a guide edge of the roller bearing.
  • the face with the larger diameter forms a leading flange and the face with the smaller diameter forms a holding flange.
  • at least the leading edge tread is at least partially ground and has a non-constant curvature.
  • the holding board running surface can be flat, constantly curved or have a non-constantly curved profile and, for example, be ground, hard-turned or manufactured by another manufacturing mechanism.
  • ground profile is understood to mean a profile that is formed by grinding and whose shape is essentially determined by the grinding.
  • a ground profile is not understood to mean a profile that is formed by another manufacturing process, for example by hard turning, and is then subjected to a vibratory grinding process, such as drumming, to correct unevenness.
  • the ground profile is preferably formed at the transition from the end face to a running surface of the roller.
  • the at least partially ground profile of the end face can merge into a profile which is formed on the running surface of the roller via a, preferably unground, edge shortening.
  • the running surface of the roller is also ground.
  • the profile, which is formed on the running surface of the roller has a non-constant curvature starting from the edge shortening.
  • the curvature is a logarithmic curvature and/or the profile is a toroidal profile.
  • the profile at 0.9 ⁇ R has a pitch ⁇ which is between 0.15° and 2° (0.15° ⁇ ⁇ ⁇ 2.0°), where R is the roller radius.
  • a profile height Y of 0.88 ⁇ R is preferably between 0.00007 ⁇ R and 0.0020 ⁇ R (0.00007 ⁇ R ⁇ Y ⁇ 0.0020 ⁇ R).
  • a maximum profile height Z can be at one Radial distance
  • the term profile height is understood to mean a distance from the profile to a reference value in the direction of the roller axis or rotation axis. For the role described above, the reference value is 0.65 ⁇ R.
  • the edge shortening range begins at a value 9940 ⁇ R and 0.9994 ⁇ R (0.9940 ⁇ R ⁇ C ⁇ 0.9994 ⁇ R), with a raceway profile preferably being formed following the edge shortening.
  • the roller has at least one unground surface area radially within the ground surface.
  • the unground surface area can, for example, be designed as a trough, a so-called dimple, in the area of the ground surface. This trough or dimple can be used, for example, to hold the roller captively on or in a cage during assembly.
  • the non-ground surface area can also be radially outside the ground surface, e.g. B. be provided at the transition to the track or on an edge.
  • an arrangement is provided with a grinding tool and a roller described above for a roller bearing, wherein the grinding tool and the roller are rotatable/movable relative to one another.
  • the grinding tool is designed in such a way that it forms the ground profile, and/or the grinding tool and the roller can be moved relative to one another in such a way that the ground profile can be formed.
  • the grinding tool and the roller can be tiltable relative to one another in order to form the ground profile.
  • the grinding tool can have a profile that is complementary to the profile to be formed on the roller.
  • the grinding tool and the roller are arranged relative to one another in such a way that they interact essentially along a linear contact area.
  • the contact area essentially corresponds to the grinding area and, roughly speaking, forms a line along which the roller and the grinding tool touch each other.
  • the contact area has a certain area, with a more precise design of the ground profile The smaller the area of the contact area, the better it is.
  • a flat profile can be obtained by rotating a radial curve, which determines the non-constant curvature, about the axis of rotation. By rotating the radial curve around the axis of rotation, a flat profile is obtained that has a non-constant curvature in the radial direction.
  • the grinding tool rotates along a rotation axis and/or the roller rotates along a rotation axis, in particular the directions of rotation of the rotation axes being selected such that an opposite movement is carried out in the contact area. This can improve the efficiency of grinding, for example.
  • the axis of rotation of the grinding tool and the axis of rotation of the roller can enclose an angle that assumes a value between 0° and 90°, in particular between 25° and 75°.
  • the angle between the axis of rotation of the grinding tool and the axis of rotation of the roller can be adjustable depending on the profile to be ground.
  • the grinding tool has the shape of a truncated cone in cross section and further has a grinding surface which is formed on the lateral surface of the truncated cone, in particular the lateral surface having the complementary profile. In this way, the profile to be ground can easily be formed on the roll.
  • the grinding surface on the truncated cone has a first larger and a second smaller diameter and the grinding tool is arranged on the roller in such a way that the first larger diameter of the grinding surface contacts the roller radially further in, ie at a smaller roller diameter, and the second smaller one Diameter of the grinding surface contacts the roller radially further out, ie at a larger roller diameter.
  • the grinding surface has a coating made of a nickel matrix with embedded abrasive particles, in particular cubic boron nitride (also called CBN) and/or diamond, with a grain size of the abrasive particles in the range between 20 and 100 ⁇ m.
  • the grain size can preferably be 50 ⁇ 20 ⁇ m, more preferably 46 ⁇ 2 ⁇ m.
  • the grinding tool can have a base body on which the coating is formed.
  • the base body can be made of metal, for example steel.
  • the base body is very stiff and preferably has a Young's modulus of more than 100 GPa.
  • CBN cubic boron nitride
  • CBN cubic boron nitride
  • diamond is made of pure carbon arranged in a tight three-dimensional matrix
  • CBN has the same three-dimensional matrix but is made up of boron and nitrogen atoms. Due to the complex atomic structure, a larger number of grain shapes are possible with CBN than with diamond, for example.
  • the possible grain shapes can range from an octahedral to a cube shape, or from an octahedral to a tetrahedral shape.
  • CBN has a high thermal conductivity, a low coefficient of friction, and a specific gravity of 3.48 g/cm 3 .
  • CBN Depending on the material to be ground, CBN also has the advantage that, unlike diamond, it does not have any carbon that gets into the material to be ground, in particular the steel alloys, diffuses and can thereby change their material properties. CBN has a long service life and excellent material removal rates and is primarily used in areas that typically have short grinding cycle times and fully automated manufacturing. In particular, powder metallurgy or high-alloy tool steels can often no longer be economically sanded using conventional abrasives.
  • the embedded abrasive particles are crushed.
  • “crushing” means breaking the grain tips in order to increase the dimensional accuracy and the ease of grinding. This is done using a carbide roller that rotates and tracks the grinding surface, which also rotates at the same peripheral speed, and breaks protruding grain tips that deviate from the profile line to a precise size. In this process, a relative speed between the two peripheral speeds of the carbide roller and the grinding surface should be as small as possible. Crushed abrasive particles enable the grinding of highly precise profiles and surface qualities. Alternatively, the embedded abrasive particles can also be non-crushed.
  • a method for producing a roller for a roller bearing as described above is provided, in particular using an arrangement described above.
  • the roll can have the allowance for its roll length.
  • a roll length is the length of the roll between the two end faces along the axis of rotation.
  • the allowance is, for example, one to four times the height of the desired profile.
  • the height of the profile corresponds to the axial extent along the ground profile in the axial direction of the roller.
  • the measurement can be in the area the axis of rotation of the roller can be lower than at the transition to the running surface.
  • the allowance can be 30 ⁇ m in the middle and 50 ⁇ m at the transition to the tread.
  • the roll provided can already have a basic shape of the desired rolls.
  • the roller can have a conical shape, a cylindrical shape, or the like.
  • the basic shape can be formed from blanks by casting and/or mechanical processing.
  • the roller provided is preferably already hardened including the two end faces and/or the running surface. Furthermore, the roller provided can be pre-ground and/or hard-turned before grinding the end profile. This can be advantageous to provide a flat surface. For example, during the subsequent grinding of the end face profile, the allowance provided can be partially and/or completely ground away in order to obtain the end face profile.
  • the end faces are preferably ground before the running surfaces.
  • a pre-ground roll can first be provided with the desired end face profiles and, following the profile-forming grinding process, a finishing process for surface refinement, for example polishing, honing, lapping, and/or vibratory grinding, as well as grinding of the running surface, can take place.
  • the method includes rotating a trough or the dimple in the region of an axis of rotation of the roller, the trough having a defined diameter.
  • the trough can preferably be formed before the end faces are ground.
  • the defined diameter of the trough can be dependent on a roller diameter.
  • the diameter of the trough is preferably smaller than 0.65 times the roll diameter. This allows the roller to be held flexibly on the cage during assembly.
  • Fig. 1 shows a roller 1 for a roller bearing, which in the illustrated embodiment is designed as a tapered roller that is used in a tapered roller bearing.
  • Fig. 2 shows a section A of a profile of the roller 1 on one of its end faces 2.
  • the roller can alternatively also have a different shape, for example a cylindrical shape.
  • the roller 1 is provided with two end faces 2, 4 and a running surface 6, the roller 1 being designed to rotate around a rotation device 8.
  • the end face 4 has a smaller diameter and the end face 2 has a larger diameter, with the end face 4 in particular contacting a guide plate (not shown) of the bearing and the end face 2 being able to contact a holding plate (not shown).
  • the end face 2 has an at least partially ground profile 10.
  • the ground profile 10 is in Fig. 2 represented by a hatched area.
  • the profile 10 has a non-constant curvature, the curvature being determined along a curve running in the radial direction and being, for example, a logarithmic curvature.
  • the ground profile 10 can have a toroidal shape.
  • the ground profile can, for example, be formed up to a transition area 14 from the end face 2 to the running surface 6 of the roller 1.
  • the transition region 14 can be designed as a preferably unpolished edge shortening, which merges into a profile formed on the running surface 6 of the roller 1.
  • the profile that is formed on the running surface 6 of the roller 1 can also have a non-constant curvature based on the edge shortening.
  • the profile of the running surface 6 of the roller 1 can have a logarithmic curvature and/or be designed as a toroidal profile.
  • Fig. 5 is a schematic graph showing a representation of the ground profile, with the roller radius R on the X-axis and the axis of rotation on the Y-axis.
  • the ground profile 10 with the non-constant curvature has a pitch ⁇ at a distance of 0.9 ⁇ R, which is between 0.15° and 2° (0.15° ⁇ ⁇ ⁇ 2.0°), where R is the roll radius or half the roll diameter.
  • a profile height Y is 0.88 ⁇ R between 0.00007 ⁇ R and 0.0020 ⁇ R (0.00007 ⁇ R ⁇ Y ⁇ 0.0020 ⁇ R).
  • the profile height is a distance from the profile to a reference value in the direction of the axis of rotation 8 of the roller 1, with the reference value being 0.65 ⁇ R for the role described above.
  • the maximum profile height Z at a radial distance X is between 0.0002 ⁇ R and 0.0065 ⁇ R (0.0002 ⁇ R ⁇ Z ⁇ 0.0065 ⁇ R).
  • transition area 14 or edge trimming area of the roll 1 begins at a value Value C, which is between 0.9940 ⁇ R and 0.9994 ⁇ R (0.9940 ⁇ R ⁇ C ⁇ 0.9994 ⁇ R).
  • a trough 12 is provided, which in the illustrated embodiment is not ground Surface area is formed and thus forms at least one unground surface area radially within the ground surface.
  • This trough 12 can, for example, serve to hold the roller 1 captively on or in a cage (not shown) during assembly.
  • the trough 12 can also be designed to be ground and/or a non-ground surface region can be provided radially outside the ground surface, ie outside the ground profile 10, for example in the transition region 14 to the running surface 6.
  • Fig. 3 shows an arrangement 20 with a grinding tool 22 and a roller 1 for a roller bearing, the in the Fig. 3 Roller 1 shown is designed as a cylindrical roller.
  • Fig. 4 shows a section X of the arrangement.
  • the grinding tool 22 has a rotation axis 24 and the roller 1 has a rotation axis 8, the grinding tool 22 and the roller 1 being rotatable relative to each other about their respective rotation axes 8, 24. Furthermore, the grinding tool 22 and the roller 1 can also be movable relative to one another. The directions of rotation of the rotation axes 8, 24 are preferably selected such that an opposite movement is carried out in the contact area of the grinding tool 22 and roller 1.
  • the axis of rotation 24 of the grinding tool 22 and the axis of rotation 8 of the roller 1 include an angle ⁇ , which can assume a value between 0° and 90°, in particular between 25° and 75°.
  • angle ⁇ between the axis of rotation 24 of the grinding tool 22 and the axis of rotation 8 of the roller 1 can be adjustable depending on the profile to be ground.
  • the grinding tool 22 has the shape of a truncated cone in cross section and has a grinding surface 26 which is formed on a lateral surface of the truncated cone.
  • the grinding surface 26 has a coating of a nickel matrix with embedded abrasive particles made of cubic boron nitride (also called CBN), a grain size of the abrasive particles being in the range between 20 and 100 ⁇ m, and preferably 50 ⁇ 20 ⁇ m and most preferably 46 ⁇ 2 ⁇ m.
  • diamond abrasive particles can also be embedded in the grinding surface 26.
  • the grinding tool 22 can have a base body (not shown) on which the coating is formed.
  • the base body can be made from Metal, for example steel, can be formed.
  • the base body is very stiff and preferably has a Young's modulus of more than 100 GPa.
  • the grinding surface 26 is provided with a profile that is complementary to the profile to be formed.
  • the grinding surface 26 on the truncated cone has a first larger diameter D1 and a second smaller diameter D2.
  • the grinding tool 22 is arranged on the roller 1 in such a way that the first diameter D1 contacts the roller 1 radially further inwards at a roller radius r1 and the second diameter D2 contacts the roller radially further outwards at a roller radius r2 (see Fig. 4 ).
  • the roller 1 and the grinding tool 22 can rotate in opposite directions It is possible to make it possible for the relative rotation speeds of the smaller roller radius r1 and the larger grinding tool diameter D1 or of the larger roller radius r2 and the smaller grinding tool diameter D2 to align, so that a difference, in particular along the contact area, becomes smaller and the relative rotation speed can be minimized . This allows the heat generated during grinding to be minimized.
  • the area in which the grinding tool 22 and the roller 1 touch essentially corresponds to the grinding area. The smaller the area of the contact area, the more precise the design of the ground profile 10 is.
  • a roller for a roller bearing with a ground end profile which has lower friction under axial load and therefore a higher axial load capacity. Grinding enables shorter processing times and thus more efficient production of the end face profiling, especially in comparison to other processing methods, such as hard turning. Furthermore, it is also possible to provide small rolling elements with an arbitrarily curved profile, which ensures an improvement in sliding friction and thus an increase in the axial load capacity of the rolling elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Claims (14)

  1. Rouleau (1) pour un roulement à rouleaux avec deux surfaces frontales (2, 4) et une surface de roulement (6), caractérisé en ce
    qu'au moins une surface frontale (2, 4) présente un profil (10) au moins partiellement rectifié avec une courbure non-constante,
    caractérisé en ce que le profil (10) à 0,9xR a une pente β par rapport à une droite le long du rayon de rouleau R qui est comprise entre 0,15° et 2° (0,15° ≤ β ≤ 2,0°).
  2. Rouleau (1) pour roulements à rouleaux selon la revendication 1, dans lequel le profil rectifié (10) est réalisé à la transition (14) entre la surface frontale (2, 4) et la surface de roulement (6), dans lequel de préférence le profil (10) au moins partiellement rectifié de la surface frontale (2, 4) se transforme en un profil réalisé sur la surface de roulement (6) du rouleau (1) par l'intermédiaire d'un raccourcissement de bord, de préférence non rectifié.
  3. Rouleau (1) pour roulements à rouleaux selon l'une quelconque des revendications précédentes, dans lequel la courbure est déterminée le long d'une courbe s'étendant dans la direction radiale.
  4. Rouleau (1) pour roulements à rouleaux selon l'une quelconque des revendications précédentes, dans lequel la courbure est une courbure logarithmique et/ou le profil est un profil torique.
  5. Rouleau (1) pour roulements à rouleaux selon l'une quelconque des revendications précédentes, dans lequel une hauteur de profil Y à 0,88xR est comprise entre 0,00007xR et 0,0020xR (0,00007xR ≤ Y ≤ 0,0020*R).
  6. Rouleau (1) pour roulements à rouleaux selon l'une quelconque des revendications précédentes, dans lequel le rouleau (1) présente radialement à l'intérieur de la surface rectifiée au moins une zone de surface non rectifiée (12).
  7. Agencement (20) avec un outil de rectification (22) et un rouleau (1) pour un roulement à rouleaux selon l'une quelconque des revendications 1 à 6, dans lequel l'outil de rectification (22) et le rouleau (1) peuvent tourner/se déplacer l'un par rapport à l'autre, dans lequel l'outil de rectification (22) est configuré de telle sorte qu'il forme le profil rectifié (10), et/ou l'outil de rectification (22) et le rouleau (1) peuvent se déplacer l'un par rapport à l'autre de telle sorte que le profil rectifié (10) peut être formé.
  8. Agencement (20) selon la revendication 7, dans lequel l'outil de rectification (22) présente un profil complémentaire au profil (10) à former sur le rouleau (1) .
  9. Agencement (20) selon la revendication 7 ou 8, dans lequel l'outil de rectification (22) et le rouleau (1) sont agencés l'un par rapport à l'autre de telle sorte qu'ils coopèrent essentiellement le long d'une zone de contact linéaire.
  10. Agencement (20) selon l'une quelconque des revendications 7 à 9, dans lequel l'outil de rectification (22) tourne le long d'un axe de rotation (24) et/ou le rouleau (1) tourne le long d'un axe de rotation (8), dans lequel notamment les directions de rotation des axes de rotation (8, 24) sont choisies de telle sorte qu'un mouvement contrarotatif est effectué dans la zone de contact, dans lequel de préférence l'axe de rotation (24) de l'outil de rectification (22) et l'axe de rotation (8) du rouleau (1) forment un angle (α) qui prend une valeur comprise entre 0° et 90°, notamment entre 25° et 75°.
  11. Agencement (20) selon l'une quelconque des revendications 7 à 10, dans lequel l'outil de rectification (22) présente en section transversale la forme d'un tronc de cône et présente en outre une surface de rectification (26) qui est formée sur la surface d'enveloppe du tronc de cône, dans lequel notamment la surface d'enveloppe présente le profil complémentaire.
  12. Agencement (20) selon la revendication 11, dans lequel la surface de rectification (26) sur le tronc de cône présente un premier diamètre plus grand et un deuxième diamètre plus petit (D1, D2) et l'outil de rectification est agencé sur le rouleau de telle sorte que le premier diamètre (D1) est en contact avec le rouleau radialement plus à l'intérieur et le deuxième diamètre (D2) est en contact avec le rouleau radialement plus à l'extérieur.
  13. Agencement (20) selon l'une quelconque des revendications 7 à 12, dans lequel la surface de rectification (26) a un revêtement en une matrice de nickel avec des particules de rectification incorporées, notamment du nitrure de bore cubique (également appelé CBN) et/ou du diamant, dans lequel une taille de grain des particules de rectification se situe dans la plage comprise entre 20 et 100 pm.
  14. Procédé de fabrication d'un rouleau (1) pour un roulement à rouleaux selon l'une quelconque des revendications 1 à 6, dans lequel notamment un agencement (20) selon l'une quelconque des revendications 7 à 13 est utilisé.
EP21193248.8A 2020-09-02 2021-08-26 Rouleau pour palier à rouleaux, agencement doté d'un outil de ponçage et d'un rouleau pour un palier à rouleaux, ainsi que procédé de fabrication d'un rouleau pour un palier à rouleaux Active EP3964724B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020211036.0A DE102020211036B4 (de) 2020-09-02 2020-09-02 Anordnung mit einem Schleifwerkzeug und einer Rolle für ein Rollenlager sowie Verfahren zum Herstellen einer Rolle für ein Rollenlager

Publications (2)

Publication Number Publication Date
EP3964724A1 EP3964724A1 (fr) 2022-03-09
EP3964724B1 true EP3964724B1 (fr) 2023-10-04

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EP21193248.8A Active EP3964724B1 (fr) 2020-09-02 2021-08-26 Rouleau pour palier à rouleaux, agencement doté d'un outil de ponçage et d'un rouleau pour un palier à rouleaux, ainsi que procédé de fabrication d'un rouleau pour un palier à rouleaux

Country Status (4)

Country Link
US (1) US11746826B2 (fr)
EP (1) EP3964724B1 (fr)
CN (1) CN114198404A (fr)
DE (1) DE102020211036B4 (fr)

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE505357C (de) 1928-12-19 1930-08-20 Timken Roller Bearing Co Kegelrollenlager mit einer Anlaufrippe
JP2003021145A (ja) * 2001-07-05 2003-01-24 Nsk Ltd ころ軸受
JP3937148B2 (ja) 2002-04-03 2007-06-27 日本精工株式会社 センタレス研削装置及びセンタレス研削方法
US7097678B2 (en) * 2003-01-06 2006-08-29 Showa Denko K.K. Metal-coated cubic boron nitride abrasive grain, production method thereof, and resin bonded grinding wheel
JP2004353744A (ja) * 2003-05-28 2004-12-16 Nsk Ltd ころ軸受
EP1632685B1 (fr) * 2003-06-12 2013-07-10 NSK Ltd. Roulement a rouleaux cylindriques
DE102005061102A1 (de) 2005-12-21 2007-07-05 Schaeffler Kg Wälzlager
DE102005061103A1 (de) * 2005-12-21 2007-07-05 Schaeffler Kg Wälzlager mit verbesserter Bordgeometrie
DE102008028164B4 (de) 2008-06-12 2021-07-01 Ab Skf Rolle und Rollenlager mit der Rolle
JP5522569B2 (ja) * 2010-01-26 2014-06-18 Ｎｔｎ株式会社 ころの製造方法
DE102011076329B4 (de) * 2011-05-24 2013-11-21 Aktiebolaget Skf Geometriekonzept für eine Wälzkörperrolle eines Rollenlagers
JP6323136B2 (ja) 2014-04-16 2018-05-16 株式会社ジェイテクト ころ軸受用軌道輪、ころ軸受及び動力伝達装置
FR3037519B1 (fr) 2015-06-17 2017-07-28 Ntn-Snr Roulements Procede de rectification d'une surface d'un corps roulant pour un palier a roulement
JP6965006B2 (ja) 2017-03-28 2021-11-10 Ntn株式会社 円錐ころ軸受
DK3615821T3 (en) * 2017-04-26 2022-10-03 Timken Co Non-elliptical contact profile for roller bearing

Also Published As

Publication number Publication date
US11746826B2 (en) 2023-09-05
US20220065295A1 (en) 2022-03-03
CN114198404A (zh) 2022-03-18
EP3964724A1 (fr) 2022-03-09
DE102020211036A1 (de) 2022-03-03
DE102020211036B4 (de) 2022-04-14

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